A line on which numbers are marked at intervals, used to illustrate simple numerical operations.

‘The ordinary numbers (or real numbers as mathematicians call them) sat on the number line running East-West in this map of imaginary numbers, while the North-South direction corresponded to the imaginary part.’

‘These jumps from one number to the next can be visualized as arcs of circles along a number line.’

‘The findings suggest that understanding relationships among numbers involves some sort of spatial tool, such as visualizing a number line.’

‘Primes are also fascinating because they seem to be scattered randomly through the number line - it's impossible to predict where they might pop up.’

‘So the real numbers are the numbers that you probably already know: they're the ones on the number line.’

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